I use motorways everyday and this speeding up thing is becoming more and more prelevant, middle lane 60mph and as soon as you go to overtake them they speed up!!! Undertaking is rife as well .I travel on Motorways once every 3 weeks or so during the working week and it usually works well. Yesterday was on the M62 and M60 and witnessed so much bad driving e.g. people didn't like to be overtaken and speeding up, middle lane hoggers at 50mph, lane 4 to junction exit in one move etc.